If they cut large portions out folks who've seen the original will know and Disney will look even worse. They have to show the whole thing.
It is more than that. If they make any significant cuts, they will have "dead air." Also, the advertisers who already paid for the series they previewed will have Cause to withhold payment (or sue) for ABC not delivering on the content they promised. This could be in the 10s of millions (or more).
The time has been sold and paid for and money advanced. There is no way in heck that they (ABC) will do anything more than an anemic "disclaimer."
These Lefty fools don't understand how the TV business works. Their little tantrum means nothing.